161.203.0.0/16

🇺🇸

IPv4ARINallocatedAS2581 RPKI Valid

CIDR

161.203.0.0/16

IP Version

IPv4

Addresses

65.5K

Mask

/16 (255.255.0.0)

Country

🇺🇸 United States

City

Washington D.C. (Northwest Washington)

RIR

ARIN

Status

allocated

Allocated

2/5/1993

Announced BGP Routes

0 of 0 routes

RPKI:

IRR:

Prefix	Origin AS	RPKI	IRR	Last Seen
This prefix is not currently announced in BGP. See covering prefix below.

9 less-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
161.203.26.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.22.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.24.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.14.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.16.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.18.0/23	AS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Valid	—	5/31/2026
161.203.15.0/24	AS10753LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE - Level 3 Parent, LLC	Valid	—	5/31/2026
161.203.19.0/24	AS10753LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE - Level 3 Parent, LLC	Valid	—	5/31/2026
161.203.16.0/24	AS10753LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE - Level 3 Parent, LLC	Valid	—	5/31/2026

Prefix	Origin	Max Length	Trust Anchor
161.203.0.0/16	AS2581	/16	arin

Origin	Registry	Maintainer	Modified
AS2581	ARIN	MNT-UGAO	8/4/2025

Origin ASN

Geolocation

Country🇺🇸United StatesUS

RegionDistrict of Columbia

CityWashington D.C. (Northwest Washington)

API

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/161.203.0.0/16" | jq

External Links